Improvement in feed-water heaters



.I. H. HALE 8; A. C. WHITNEY.

Feed-Water Heaters.

'No. 145,059. Patented De c. 2,1873.

Witnesses.- fizz/enters h owwd. %%J LMJM% W K41 Ml. PHOTO-UTHOGRAFHIL60W X/asinmvz's FRUCESS} out through the chimney.

UNITED STATES FFIon.

ATENT JOHN H. HAT 1E AND ALFRED O. YVHITNEY, OF BOSTON, MASSACHUSETTS.

IMPROVEME NT IN FEED-WATER HEATERS.

Specification forming part of Letters Patent No. 145,059, dated December2, 1873; application filed October 30, 1873.

. To all whom 'it may concern:

Be it known that we, JOHN H. HALE and ALFRED G. WHITNEY, both of Boston,in the county of Suffolk and State of Massachusetts, have jointlyinvented certain new and useful Improvements in Feed WVater Heaters forBoilers; and we do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it pertains to make and use it, reference being hadto the accompanying drawings, which form part of this specification.

Our invention relates to improvements in feed-water heaters forsteam-boilers, &c., consisting in the employment of a spiral tube ofsuitable metal, placed in the connection be tween the boiler and thechimney, through which tlTe fEed-water is forced before it enters theboiler. The spiral tube or pipe aforesaid is made of a decreasingoutside diameter toward its upper end, so as to present a larger surfaceto the escaping hot gases from the fines or tubes on the boiler, andalsofor the purpose of preventing the sparks from going The feed-water isforced in through the lower end of the spiral tube, and, after passingthrough the whole of it, is forced from the upper end thereof into theboiler. In combination with said spiral heating-pipe, we employ acheck-valve in the lower end of said pipe, so as to prevent the pressurein the boiler from forcing out the water from the spiral heating-tube,by which arrangement we are able at all times to retain water in thespiral heating'tube, and thereby prevent the heating-tube fromoverheating.

By the employment of this our improved feed-water heater, we are able toheat the wafor to more than 300 Fahrenheit before it enters the boiler,and thus effect a great saving a represents an ordinary boiler, providedwith fines or tubes 1), through which the hot products from thefireplace are conducted to the chamber or connection 0, as usual. (1represents the chimney leading from the connection 0. In the chamber 0we locate a spirallywound pipe, 0, as shown in Fig. 2. The spiral. pipee is made of a larger outside diameter at the bottom than at the top, asshown in Fig. 2, the object of which is to present a large surface forthe heated products to act upon, and also for the purpose of arrestnigthe sparks that are conducted from the flues to the chamber 0. To thelower end of the spiral pipe 0 is connected a check-valve, f, outsidethe chamber 0, for the purpose of preventing the water from escapingfrom our spiral heater.

It will be seen by reference to the drawings that our spiral heater ismade without any joints whatever in the heating-chamber c, and that,therefore, all leakage, on account of the expansion and contraction ofthe spiral pipe 0, is entirely obviated.

The water, after passing through our improved heater c, is forcedthrough a connecting-pipe, 9, into the boiler a.

By the use of our improved feed-water heater 0, we are able toaccomplish two purposes, namely, a considerable reduction of the amountof fuel used for generating a certain quantity of steam, and, secondly,to arrest the sparks in the chamber 0, and prevent them going up thechimney.

- To prevent the water and steam from being forced out through the pipe9 in case it should break or get damaged, we provide the said pipe 9, asclose to the boiler as possible, with a stop-valve, h, as shown in thedrawing.

A small pipe, 17, provided with a stop-valve, 7.1, connects the lowerpart of the spiral c to the water-space in the boiler a, for the purposeof keeping up a constant circulation of the water in the heater 0, evenif the feedpumps should get out of order, and no water forced fromwithout through the heater 0. By means of the stop-valve 7c and pipe i,we are also able to regulate the proper circulation of the water throughthe feed-pipe c.

Having thus fully described the nature, construetion and operation ofour invention, we wish to secure by Letters Patent and claim- Thecombination of a boiler, a, smoke-box 0, chimney d, the spirally-woundtapering feedpipe 6, check-valve f, connecting-pipe g, stopvalve h,regulating-pipe 5, and the stop-valve 7;, when combined and arrangedsubstantially as herein shown and described.

In testimony that We claim the foregoing we have hereunto set our handsthis 10th day of October 1873.

JOHN H. HALE. ALFRED G. WVHITNEY. itnesses:

ALBAN ANDREN, GEORGE E. PHELPS.

